A robot apparatus includes: a robotic arm provided with a robotic hand capable of changing its position and its orientation by using joints; a visual sensor which measures a position or an orientation of a gripped object gripped with the robotic hand at a measurement teaching point; and a control device. The control device controls the position or the orientation of the gripped object when the gripped object is attached to an attachment target object at a corrected teaching point corrected based on a measurement result by the visual sensor. In this case, the control device determines a measurement teaching point, where the measurement with the visual sensor takes place, such that a driving direction of each of the joints from the measurement teaching point to the corrected teaching point is set to a definite driving direction.

A medical observation device includes: an imaging device; a support unit that supports the image-capturing unit and includes arms and joints rotatably connecting the arms; a motor that applies power to at least one of the joints, and rotates two of the arms connected at the joint relative to each other; a gear mechanism that includes two intermeshing gears and is disposed in a power transmission path from the motor to the at least one joint; an operation receiver that receives a user operation; and a controller that performs first control for causing the motor to rotate in accordance with the user operation received by the operation receiver and performs second control after the first control is completed and rotation of the motor is stopped.

A motor control device capable of promptly positioning a driven object at a target position, while suppressing backlash. The motor control device includes an operation command generation section for generating a first operation command and a second operation command for first and second motors to move the driven object; a preload command generation section for generating a first preload command which is added to the first operation command and a second preload command which is added to the second operation command in order that drive axes of the first motor and the second motor provide the driven object forces in opposite directions; and a preload command adjustment section for adjusting the first preload command and the second preload command in order that an absolute value of the above forces is decreased when an operation amount exceeds a predetermined threshold value.

A robot apparatus includes: a robotic arm provided with a robotic hand capable of changing its position and its orientation by using joints; a visual sensor which measures a position or an orientation of a gripped object gripped with the robotic hand at a measurement teaching point; and a control device. The control device controls the position or the orientation of the gripped object when the gripped object is attached to an attachment target object at a corrected teaching point corrected based on a measurement result by the visual sensor. In this case, the control device determines a measurement teaching point, where the measurement with the visual sensor takes place, such that a driving direction of each of the joints from the measurement teaching point to the corrected teaching point is set to a definite driving direction.

A medical observation device includes: an imaging device; a support unit that supports the image-capturing unit and includes arms and joints rotatably connecting the arms; a motor that applies power to at least one of the joints, and rotates two of the arms connected at the joint relative to each other; a gear mechanism that includes two intermeshing gears and is disposed in a power transmission path from the motor to the at least one joint; an operation receiver that receives a user operation; and a controller that performs first control for causing the motor to rotate in accordance with the user operation received by the operation receiver and performs second control after the first control is completed and rotation of the motor is stopped.

A motor control device capable of promptly positioning a driven object at a target position, while suppressing backlash. The motor control device includes an operation command generation section for generating a first operation command and a second operation command for first and second motors to move the driven object; a preload command generation section for generating a first preload command which is added to the first operation command and a second preload command which is added to the second operation command in order that drive axes of the first motor and the second motor provide the driven object forces in opposite directions; and a preload command adjustment section for adjusting the first preload command and the second preload command in order that an absolute value of the above forces is decreased when an operation amount exceeds a predetermined threshold value.

In this machining method, in which a rotary tool is moved relative to a workpiece and/or the workpiece is moved relative to the rotary tool so as to machine a curved surface on said workpiece, rotation in the direction of said curved surface is added to the workpiece such that the positions of reversal marks left on the curved surface per tool path are dispersed in the direction of said rotation.

A motor control device includes a first position detecting unit for detecting a position of a movable part, a second position detecting unit for detecting a position of a driven part, an error computing unit for computing an error between a first position detection value detected by the first position detecting unit and a second position detection value detected by the second position detecting unit, a memory unit for memorizing, as an initial error, an error computed when the movable part engages with the driven part, a compensation amount computing unit for computing a backlash compensation amount for compensating backlash, a compensation gain computing unit for computing a compensation gain based on the acceleration command, and a compensation amount computing unit for computing the backlash compensation amount using the compensation gain.

In this machining method, in which a rotary tool is moved relative to a workpiece and/or the workpiece is moved relative to the rotary tool so as to machine a curved surface on said workpiece, rotation in the direction of said curved surface is added to the workpiece such that the positions of reversal marks left on the curved surface per tool path are dispersed in the direction of said rotation.

A motor control device includes a first position detecting unit for detecting a position of a movable part, a second position detecting unit for detecting a position of a driven part, an error computing unit for computing an error between a first position detection value detected by the first position detecting unit and a second position detection value detected by the second position detecting unit, a memory unit for memorizing, as an initial error, an error computed when the movable part engages with the driven part, a compensation amount computing unit for computing a backlash compensation amount for compensating backlash, a compensation gain computing unit for computing a compensation gain based on the acceleration command, and a compensation amount computing unit for computing the backlash compensation amount using the compensation gain.